We have found 12 plants that meet your criteria.

yarrow
Achillea millefolium 'Lilac Beauty' yarrow An unusual lilac, yarrow £7.99 Buy
New
African lily
Agapanthus 'Phantom' African lily A luscious evergreen form £8.99 Buy
dusky cranesbill
Geranium phaeum 'Lily Lovell' dusky cranesbill Iridescent saucers of purple flowers. Good for shade £7.99 Buy
veronica
Hebe 'Mrs Winder' veronica Purple foliage and bright blue flowers £9.99 Buy
Crocus Special Offers
lavender promotion - 6 pack
Lavandula angustifolia lavender promotion - 6 pack... 6 Lavenders for less than £2.50 each NOW £14.99 Buy
Jerusalem sage
Phlomis tuberosa 'Amazone' Jerusalem sage Whorls of lilac flowers and architectural seedheads £8.99 Buy
shrubby veronica
Hebe 'Red Edge' shrubby veronica Small hebe with lilac flowers £9.99 Buy
phlomis
Phlomis cashmeriana phlomis Distinctive whorls of lilac flowers in high summer £8.99 Buy
convolvulus
Convolvulus sabatius convolvulus A prolific display of violet-blue flowers £9.99 coming soon
meadow cranesbill
Geranium pratense meadow cranesbill White blue or violet flowers in summer £6.99 coming soon
hebe
Hebe 'Autumn Glory' hebe Long flowering, evergreen shrub with purple flowers £9.99 coming soon
shrubby veronica
Hebe 'Caledonia' shrubby veronica Splendid violet coloured flowers £8.99 coming soon